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Molecular divergence in a marine animal-microbial symbiosis since the closure of the Isthmus of Panamá

Project description

Animal–microbial symbiosis evolution in Panama Isthmus

The findings of recent studies show that host-adaptive responses to environmental change rely on the role played by host-associated microbes. Exploring the past and using geological events that were evolution drivers, it’s possible to obtain significant knowledge of the adaptive mechanisms. The formation of the Panama Isthmus has divided species between the new oceans and led them to adaptive processes. As a result, many genetically very similar species living in highly divergent environments exist. The EU-funded PANSYMBIOSIS project will explore drivers and processes of speciation, diversification and adaptation. The project will study the evolution of an animal–microbial symbiosis divided by the Isthmus into several twin species pairs comparing lucinid clam populations and their endosymbiotic bacterial chemosymbionts.

Objective

Recently it has become clear that host-associated microbes play a major role in host adaptive responses to environmental change. To predict future responses, we can explore the past and use geological events, which provide valuable insights into adaptive mechanisms because these events were major drivers of evolution. The formation of the Isthmus of Panamá separated a previous, ancient ocean and all of its marine life into the Pacific Ocean and the Caribbean Sea. These two oceans have developed into very different habitats. Closely related animal populations that were separated by the Isthmus had to adapt to diverging environmental conditions. Today we find closely related species pairs, i.e. geminate species, that are genetically very similar but live in highly divergent habitats. This provides a powerful study system to explore drivers and processes of speciation, diversification, and adaptation. In this project, I am integrating this knowledge to study the evolution of an animal-microbial symbiosis that was divided into several geminate species pairs by the Isthmus of Panamá. I am going to compare lucinid clam populations (Lucinidae) and their endosymbiotic bacterial chemosymbionts (Candidatus Thiodiazotropha) at the genomic and transcriptomic level. Lucinid clams are an excellent model system in this context because their shells are preserved as fossils and we know that they have existed before the Isthmus closed. Hence, I can calibrate the rates of molecular evolution with the closure of the Isthmus. By studying several populations of hosts and bacterial symbionts, I will be able to use population genetic theory to inform how this symbiosis evolves in response to changing environmental conditions.

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MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)

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Call for proposal

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(opens in new window) H2020-MSCA-IF-2020

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Coordinator

MAX-PLANCK-GESELLSCHAFT ZUR FORDERUNG DER WISSENSCHAFTEN EV
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 174 806,40
Address
HOFGARTENSTRASSE 8
80539 MUNCHEN
Germany

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Region
Bayern Oberbayern München, Kreisfreie Stadt
Activity type
Research Organisations
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 174 806,40
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